Faith does not rest in some feeling of certainty; it consists in a deep willingness to cling to God, to submit to Him, as a blind person surrenders to the hands of the one who leads him. There is one danger for you, and the devil constantly tries to make you fall into it: that danger lies in the fact that through self-examination you once again turn back to yourself, which can plunge you into confusion and anxiety every time you do not feel that you have faith. Even such feelings surrender to God, if it is better for His glory that we believe in the darkness.
(Cardinal Charles Journet /1891–1975/, correspondence)